.login {
  width: 100%;
  height: 100%;
  background-image: url('http://cdn.vsery.com/picture/public/background.jpg');
  background-size: cover;
  background-position: center;
  position: relative;

  &-con {
    position: absolute;
    right: 160px;
    top: 50%;
    transform: translateY(-60%);
    width: 300px;

    &-header {
      font-size: 16px;
      font-weight: 300;
      text-align: center;
      padding: 30px 0;
    }

    .form-con {
      padding: 10px 0 0;
    }

    .login-tip {
      font-size: 10px;
      text-align: center;
      color: #c3c3c3;
    }
  }

  .circles {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;

    li {
      position: absolute;
      display: block;
      list-style: none;
      background: rgba(255, 255, 255, .7);
      animation: animate 25s linear infinite;
      bottom: -200px;

      @keyframes animate {
        0% {
          transform: translateY(0) rotate(0deg) scale(1, 1);
          opacity: 1;
          border-radius: 0;
          filter: hue-rotate(0deg);
        }

        100% {
          transform: translateY(-1300px) rotate(720deg) scale(1.5, 1.5);
          opacity: 0;
          border-radius: 50%;
          filter: hue-rotate(-15deg);
        }
      }

      &:nth-child(1) {
        left: 15%;
        width: 40px;
        height: 40px;
        animation-delay: 0s;
      }

      &:nth-child(2) {
        left: 5%;
        width: 10px;
        height: 10px;
        animation-delay: 2s;
        animation-duration: 12s;
      }

      &:nth-child(3) {
        left: 70%;
        width: 10px;
        height: 10px;
        animation-delay: 4s;
      }

      &:nth-child(4) {
        left: 40%;
        width: 30px;
        height: 30px;
        animation-delay: 0s;
        animation-duration: 18s;
      }

      &:nth-child(5) {
        left: 65%;
        width: 15px;
        height: 15px;
        animation-delay: 0s;
      }

      &:nth-child(6) {
        left: 75%;
        width: 75px;
        height: 75px;
        animation-delay: 3s;
      }

      &:nth-child(7) {
        left: 35%;
        width: 100px;
        height: 100px;
        animation-delay: 7s;
      }

      &:nth-child(8) {
        left: 50%;
        width: 50px;
        height: 50px;
        animation-delay: 15s;
        animation-duration: 45s;
      }

      &:nth-child(9) {
        left: 20%;
        width: 35px;
        height: 35px;
        animation-delay: 2s;
        animation-duration: 35s;
      }

      &:nth-child(10) {
        left: 85%;
        width: 70px;
        height: 70px;
        animation-delay: 0s;
        animation-duration: 11s;
      }
    }
  }
}
